There is no need to include MANIFEST.MF so we should not enforce plugins to use MANIFEST.MF

src/core/de.evoal.core.plugin/pom.xml

@@ -194,7 +194,7 @@
 					</execution>
 				</executions>
 			</plugin>
-
+<!--
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-jar-plugin</artifactId>
@@ -208,6 +208,7 @@
 					</archive>
 				</configuration>
 			</plugin>
+-->
 		</plugins>
 
 		<pluginManagement>